Pipette barrel



FIG. 1 is a front view of a first embodiment of a pipette barrel showing my new design;

FIG. 2 is perspective view of the design of FIG. 1;

FIG. 3 is a front view of a second embodiment of a pipette barrel showing my new design; and,

FIG. 4 is a perspective view of the design of FIG. 2;

The broken lines in the Figures are included for the purpose of illustrating portions of the pipette barrel that form no part of the claimed design. 

CLAIM The ornamental design for a pipette barrel, as shown and described. 